Multiple action power press



.April 4, 1950 v, GEQRGEFF 2,503,037

MULTIPLE ACTION POWER PRESS INVENTOR. E vns/L GEOEGEFF BY LSQMM H TTOENEY April 4, 1950 v. GEORGEFF 2,503,037

MULTIPLE ACTION POWER PRESS Filed Aug. 23, 1948 6 Sheets-Sheet 5/lI/l/l/l/l/A IN V ENTORL VA'S/L GEOEGEFF' April 4, 1950 v. GEORGEFF2,503,037

MULTIPLE ACTION POWER PRESS Filed Aug. 25, 1948 6 Sheets-Sheet 4 IN VENTOR.

VHS/L GEOEGEFF BY MKSM April 1950 v. [GEORGEFF 2,503,037

MULTIPLE AQTION POWER PRESS Filed Aug. 23, 1948 6 Sheets-Sheet 5 IN VENTOR. VHS/L GEOEGEFF 147' TOP/V5 Y Patented Apr. 4, 1950 IMULTIPIVJENACTION POWER PRESS VasllGeorgefl'j Chicago, Ill., asslgnor toDanly Machine Specialties, Inc., Chicago, 111., a corporation ofIllinois Application Augie 23 1948, Serial No. 45,170

My invention relates presses and more particularly to a multipleaction'power press of improved construction making for, a strongercrown, simplified assembly and the elimination of overhang at the sidesof the crown. g

to multiple action power I 5 Claims. (01. 74-40) Many forms of multipleaction power presses are known to the art. presses provided with. aplurality of slides in which one, is usually adapted to act as a blankholder to grip or hold work while another slide or slides is'performingactual shaping or forming operations. v I g In general the operatingmechanism for the slides in the prior arthas employed a number ofseparate cranks usually spaced one from the other in order to'give theproper phase relations. This has entailedthe employment of acorrespondingly large number of linkages which resulted in the provisionof. an oversized crown havin awide lateral dimension and customaryoverhang of the main frame ofthe press to a considerable extent. Themassive size of the crown of the press not only increased its cost anddifficulty of assembly, but occupied a, large floor areain ,amanufacturin plant where space is frequently at a premium.

They comprise power It has been suggested; by man K; Johansri Patent2,257,383, that the number .of cranks could be reduced by 1311811 156 ofa; pair of gears' secured to a common crank which common crankwasemployed to operate the rocker member for one; of the SlideS. Whilethis construction has been an improvement ov er some of the priorart;;yet the crown of the Johansenpress i s still formed with; anoverhan at the sides of the press and the assembly is still complicated.

, e v Then too, in the Johansen construction there isconsiderablelateral thrust in the blank holder drive which reduces correspondinglythe vertical thrust,

desired. 3 I v r Qne-object of my invention-is to provide a multipleaction power. press having a pair .of slides, one of which is driven as'a blank holder,

and the other of which is drivento dothe work,

of simplified construction.

Another object ofmy invention is to provide a double action. pressemploying adouble eccentricgear, thuseliminating the us of a pluralg r kgu Another object my A further object of my invention is to provide adoubl action power press in which the inner or workin slide is driven byan eccentric gear carrying a second eccentric driving the blank holderslide through a linkage to provide the proper phase relations betweenthe two slides.

Still another object of my invention is to pro- 1 vide a multiple actionpower press having .a

crown of less width than the crowns of the presses of the prior art, yetstronger in construc tion.

Another object of my invention is to provide a multiple action powerpress in which the assembly of the press is simplified and in whichoverhanging portions of the crown are obviated.

Other and further objects of my invention will appear from the followingdescription.

' In general my invention contemplates the provision of a pair of slidesone of which is driven directly by an eccentric and the other isdriven-* by a second eccentric formed integral with the first eccentricupon a gear, through a rocker shaft and-an appropriate linkageproviding'for a proper period of dwell of the blank holder dur-' in theworking part of the cycle of a second slide. Th use of two eccentricsupon a common gear establishes a predetermined phase relation f -'of themovement of the connecting rods or pitmans driven by the eccentrics andavoids the use of plurality of cranks for driving the respective slides.

Inthe accompanying drawings which form part 7 i of the instantspecification and which are to be read therewith, and in which likereference num erals'are used to indicate like parts in the various viewsFigure 1 is a front elevation of a multiple action power press made inaccordance with one embodiment of 'my invention.

Figuref2 is a fragmentary sectional elevation drawn on an'enlarge'dscale of the crown of the press shown in Figure 1.

invention is to provide a multiple action power press providing for thedwell of the blank holder slide with a reduced jacent its bottom.deadcenter four times through a very small amplitude. The amplitudeofthis oscillation is in the order of .003of an inch and is so small asto be within the range of elongation of the metal of the linkages andthe tie rods. of the press. As a practical matter the blank holderdwells apparently immovably at bottom ;dead center to hold the workwhile work is being performed by the inner slide. 'Ihe ar;- rangement ofparts is such that the rocker shaft driving eccentric, the connectionbetween crank 96 and the link 94 and the connection between lower bellcrank arm ll 6 and connecting rod H8 all arrive in the vicinity of theirdead centers at substantially the same time. It is in this manner thatthe dwell is achieved by a continuously rotating drive with the use ofonly cranks and links.

The phase relationships of the movement of the blank holder with respectto the inner slide can be readily seen by reference to Figure 6.Starting from top dead center of the inner slide we find that the blankholder slide is already moving downwardy reaching its bottom dead centerat approximately 90 at which point the period of dwell starts, duringwhich there is the very slight oscillatory movement through a smallamplitude which was described above. "The inner slide continuesdownwardly with simple harmonic motion and performs its work. At about210 of travel of the eccentric gear the blank holder slide, the drivingeccentric actuating which leads the eccentric which drives the innerslide, begins to move upwardly and'reaches its top dead center at about320 while the inner slide continues its upward motion.

It is believed that the operation of my press will be clear from theforegoing description. It will be seen that I have accomplished theobjects of my invention. I have provided a multiple action power presshaving a pair of slides, one of which is driven as a blank holder, andthe other of which is driven to do the work, of simplified construction.I have provided a double action power press employing a double eccentricgear thus eliminating the use of plurality of cranks and providing aconstruction employing a reduced number of linkages and parts. I haveprovided a double action power press in which the forces are appliedsubstantially vertically, thus reducing lateral thrust and enabling theuse of a crown having less width. I have provided a multiple actionpower press in which the: assembly is simplified and in which theoverhanging crown portions are obviated.

It will be understood that certain features and sub-combinations are ofutility and may be employed without reference to otherffeatures andsubcombinations. This is contemplated by and is within the scope of myclaims.) It is further obvious that various changes may be made indetails within the scope of my claims without departing from the spiritof my invention. It is, therefore, to be understood that my invention isnot to be limited to the specific details shown and described.

Having thus described my invention, what I claim is:

1. A multiple action power press including in combination a frame havinga crown, a pair of slides mounted for reciprocation in said frame, apair of shafts extending across said crown, a pair of gears journalledupon said shafts, means for rotating said gears, each of :;said gearsbeing formed with a pair of eccentrics, one of said eccentrics'iof,-ea'chigear being. angularly displaced. from the other of saideccentrics, a pair of rocker I shafts carried by said crown each havinga pair.

of the other pair of rocker shaft cranks to respective upper arms of thebell cranks and connecting rods connecting the lower arms of said bellcranks to the other of said slides.

"21A" power press as in claim 1 in which the rocker shafts arepositioned above said gear shafts and, the dimensions of the parts aresuch that as the rocker-shaft-operating pitmans approach bottom deadcenter said second rocker shaft cranks will approach forming an angle ofwith the links connecting the upper bell crank arms, and the lower bellcrank arms will approach forming an angle of 180 with the connectingrods extending to the second slide whereby said second slide will dwellat a position close to its bottom dead center while said first slidemoves with simple harmonic motion.

3. In a multiple action power press a crown, a pair of rocker shaftscarried by said crown, a second pair of shafts carried by said crown, apair of gears journalled about said second shafts, each of said gearsbeing formed with a pair of eccentrics, a pair of slides, a pair ofpitmans connecting one pair of said eccentrics to one of said slides,each of said rocker shafts having a pair of cranks, a pair of pitmansconnecting the other pair of said eccentrics to one pair of rocker shaftcranks, a pair of bell cranks journalled about said second shafts, linksfor connecting the other of said rocker shaft cranks to the upper bellcrank arms, connecting rods for connecting the lower bell crank arms tothe other of said slides, the eccentrics of one of said gears extendingtoward the rear of said press and the eccentrics of the other of saidgears extending toward the front of said press.

4. A multiple action power press including in combination a pair ofslides, a pair of eccentrics, means for rotating said eccentricstogether, a pitman carried by one of said eccentrics and extending toone of said slides for reciprocating the same with simple harmonicmotion, a rocker shaft having a pair of cranks, a pitman for connectingone of said cranks to the other of said eccentrics, a bell crank, a linkpivotally connecting the other of said cranks with one of said bellcrank arms, a connecting rod between the other of said bell crank armsand the other of said slides, a driven gear journalled upon a shaft,said eccentrics being formed integrally with said gear, one of saideccentrics being of larger diameter than the other and having its centerangularly displaced from the other of said eccentrics.

5. A multiple action power press including in combination a pair ofslides, a pair of eccentrics, means for rotating said eccentricstogether, a pitman carried by one of said eccentrics and extending toone of said slides for reciprocating the same with simple harmonicmotion, a rocker shaft having a pair of cranks, a pitman for connectingone of said cranks to the other of said eccentrics, a bell crank, a linkpivotally connecting the other of said cranks with one of said bellcrank arms, a connecting rod between the other of said bell crank armsand the other of said slides, a driven gear journalled upon a shaft,said eccentrics being formed integrally with said gear, one of saideccentrics being of larger diameter than the other and having its centerangularl'y displaced from the other of said eccentrics, the pitman forreciprocating one of said slides being disposed about the larger of saideccentrics, and the pitman for operating said rocker shaft beingdisposed about the smaller of said eccentrics.

VASIL- GEORGEFF;

REFERENCES CITED The following references are of record in the file ofthis patent:

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